Dynamo-electric apparatus for firing mines.



K. SGHAFFLER, REKTE (3503MB.

DYNAMO ELECTRIC APPARATUS FOR FIBIKQ IYHFJES.

APPLICATION I'ILBD PBBA, 1913.

1 1 1 Patented Sapt;

2 SHEETS-SHEET 1.

amm-

K. SUHAFPLER, REKT-E GLOSSL. DYNAMO ELECTRIC APPARATUS FOR mm MINES.

APPLICATION FILED PBS. 4, 1913 Patented Sept. 9, 1913.

Q? I W I.

' UNITED STAT E S PATENT "OFFICE.

roman scnarrma; um ate s51, Q11 VHJNNA, AUSTRIA-HUNGARY.

DYNAMO-E LECTBIC AP IPARATU'S FOR FIRING MINES.

cification of Letters Patent.

Patented Sept. 9, 1913.

Application filed February 4, 1913. Serial No. 746,200.

1T0 all whom it may concern:

'- the art to which it appertains 'to' make and ures of reference marked thereon, 15.

being had to the acuse the same, reference and to letters or figoompanying drawings,

form a part of this specification. y

This invention relates to. a spring actuated electrical apparatus for firing mines, the source of current of which apparatus is constituted either by a dynamo machine orby a magnetic inductor. In similar-,mine

, firing apparatus the winding upof the actu'ating spring is performed by means of a key,a crank or the link; the mechanism comprising a pawl which engages .a ratchet 'wheel provided in "the transmission gear,

locks this gear and prevents'the release of the actuating spring. The starting of the firing apparatus is performed by disengaging the awl -from the said ratchet wheel. If now t e .pa'wl should be raised out ofengagement with the ratchet wheel .and con- .sequ'ently the current generator put in op- :that: the raising 'era'tion before the actuating spring has been lcompletely or s'ufici'ently 85,

wound up, thecurrent which will'be caused to flow through thefiring circuit connected to the firing device' will be too weak, and consequently the igniters comprised in the firing circuit will not be brought to explosion or only some of them will explode.

The present invention has for its purpose to provide an improved arrangement of the apparatus for firing mines ofthe kind above referred to, and the improvement essentially consists in means whereby the apparatus can only be operated to generate the current when the actuating spring is completely wound up. According to the -invention this is obtained-in such a manner of the above" mentioned pawl out of engagement with the ratchet of the driving wheel, which is performed by means of a hand operated'key, lever or the like, can take place only when. the actuating spring is completely wound up, so that the sending of too weak a current into the declare the following to be a full,-

e'n'able others skilled in firing [circuit and consequently missfires are for preventing the premature disengagement of the pawl prevent at the same time during the running out of the actuating spring, so that the released spring cannot be interrupted.

The object of the invention is represented drawings in whieh- Figure 1 showsa front ,elevation of the firing apparatus with the front plate removed; Fig. 2 represents a side elevation 3 and are detail side and end views of the locking and releasing organs.

ated by a pinion c keyed on the shaft 6 of the armature said pinion meshing with a toothed wheel d that forms the casing or barrelfof the driving spring f. The spring f has one end aflixed to the wall of the casing, and the other end fastened to the shaft e liminary the toothed wheel d in the direction of the arrow 1 the said spring is completely wound up and is standing under full tension. The toothed wheel 03 is provided with a nose which during the rearward rotation of the toothed wheel -d corresponding to the unwinding of the spring f comes into contact with an abutment i afiixed to the frame h of the apparatus in the path of the nose and has for its purpose to limit the rearward rotation of the spring barrel and thus to prevent the complete unwinding of the spring f, In order to prevent a violent shock by the recoil of the spring barrel this abutment iconsists of a strong spring. An arc-shaped recess g (Fig. 1) is formed in the frame of the. apparatus in the vicinity of the spring or abutment 2' and permits this spring 2' to bend under the action of the nose 9 striking against the same. The winding up of the main spring f is performed by a pinion meshing with the toothed wheel d and keyed upon the winding-up shaft 70, this latter being provided with catching pins. The toothed wheel d ring on which is arranged between the ,toothed wheel d and the ratchet ring Z and may be of a somewhat greater diameter than the ratchet ring Z.

the reengagement of the pawl in the ratchet by way of an examplein the accompanying The armature a of the dynamo is actucarries a: ratchet ring Z and a projecting absolutely prevented. The means provided I of the driving gear of the apparatus; Figs.

ofthe toothed wheel 11, and is under pretension; after a full revolution of.

arrow II.

In the frame it of the apparatus is piv-. oted a shaft 0 that can be rotated by means of a key or. of a lover or the like and upon this shaft 0 is loosely mounted a pawl n which is kept in engagement with the ratchet ring Z by means of a spring p. On the shaft 0 is furthermore fixed a ring 9 provided with a shoulder r. This shoulder is of such a length that when the ring g is rotated in the direction of vthe arrow II (Fig. 1 the end of this shoulder r abuts against the projecting ring m and thus prevents a further rotation of the ring 5/. .The shoulder 7" of the ring g is provided with a lateral projection reaching between two abutments n n provided on the pawl n. A spring t always tends to rotate the ring 9 in such a manner as to make the projection s bear against the abutment n of the pawl 92.

The ring ,m is provided in its periphery with a recessed portion u which lies oppo-v site the ring 9 and the pawl 1 when the main spring f is either completely wound up or completely unwound. This recessed portion is suficiently deep to permit the shoulder rof the ring 9 to be swung by the,rotation of the shaft 0 in the direction of the In th" position of the driving members shown in Fig. 1 themainspring f is unwound, and these members take more or lessthe same positionnvhen they are under full tension. In either case the pawl 02 can be brought out of engagement wit-h'the ratchet Z by turnin the; shaft 0. which rotates the ring 9 in t c direction of the arrow IIagainst the action of the spring 2f until the lateral projection s ofthe shoulder 7-- bears against the abutment n of the pawl n, and overcoming the pressure of the spring 7) pushes the pawl n in its position shown in dash and dot lines' During this motion the shoulder 7* has passed the recessed. portion of the ring mend has occu pied the position shown in dash and dot lines. When the spring f has been-put under tension and released the toothed wheel (Z rotates backward for nearly a full revolotion. Directly at the beginning of this rearward rotation therecessed portion 14 of the ring m passes the releasing members 71 'r and the full, non-recessed part of the ring then'engages the shoulder r of the ring 9.

which is in its position, shown in dash and dot lines. In this manner the projecting ring m prevents the ring g i'rom returning into its position shown in full lines under the action of the spring t during the rearward rotation of the toothed wheel a? when the lreyflever or like part which actuates the shaft 0 should be accidentally released. In this manner the pawl n is prevented from coming again into engagement with the ratchet Z during thejrearward rotation of the latter; Only nearly :hili

revolution of the tootheii wheel recessed portion-a rot" the r u comes opposi. e-the shoulder as can g and the pawl it return leach again their respective positions shown lines under the action of the 5 72 respectively I When the main spring f Facing up,by\therotation of the toothed WEI, in the direction of thc'arrow 1', the 2' portion 21, oft-he ringm passes t e r of the ring q. the hegir movement, The projecting it rents the ring a with its shout being brought into the position sh dash and dot lines and prevents pawl n from beingraised out of ment with the ratchet Zr until a full revolution orthe toothed and the main spring f is comple'i'iely "6 up, so as to be under full tension recessed portion u of the'ring m 1.: passingthe shoulder r. the on; f be released and should put the dyes on machine in operation before this spring is completely wound up it'woulil resultin sending currents of insufiicient strength into the igniting circuit and consequently a misfiring or -the igniter. The same conditions would occur when the pawl n was brought into engagemenltv with the ratchet- Z before the spring f has been-"com? pletely unwound. Now, the" improve ipparatus hereinhefone described ab rutelyand securely prevents a premature release of the main spring and also apremature re- I enga ementof the pawl in the'ratchet dur ing the release of the main spring.

The entire mine firing apparatus is -ar ranged within a closing casing in such a manner that only the ends of the shafts 7c and 0 extend out of the casing.

I claim. A

1. In a dynamo-electric firing apparatus, a spring for rotating the armature of the apparattis, means-to put the spring under tension, and means to prevent the release of the tensioning means before the spring is under full tension.

2. In a dynamo-electric firingapparatus, a spring 'for rotating the armature of theapparatus, a ratchet wheel adapted to put the spring under tension, a pawl to engage the ratchet wheel, a pawl actuating member,

and means to prevent the operating oi the lattenduring the winding and unwinding of the spring.

3. In a dynamo-electric firing s' para a springfor rotating the arnizif e of apparatus, a ratchet wheel to tension the spring, a pawl to engage the ratchet means to move the pawl out'of engagement with the ratchet, and means to prevent the operation of said nioringmeans during unwinding of the spring 4. In a d \'uamo-clectric firing apparatus, for rotating the armature of the a spring apparatus, a ratchet connected with the spring, a barrel to rotate the ratchet to put the spring under tension, a pawl adapted to engage the ratchet, means to move the pawl out of suchengagement, and means on the barrel to lock the pawl moving means during the winding and unwinding gage the ratchet, a rotatable member adapt; ed to engage the pawl and move the latter away from the ratchet, and a ringon the spring barrel adapted to lock the rotatable member in engagement with the pawl during the unwinding of the sprin .v

v6. In a d 'namoelectric firing apparatus, a spring for rotating the armature of the apparatus, a barrel to wind the spring, a ratchet on the barrel, a swinging pawl movable into engagement with the ratchet, a rotatable actuating member to engage the pawl and move the latter away from the barrel inc'losing the spring a ratchet on the barrel, a pawl adapted to en'-,

ratchet, a ring on the spring barrel adaptto engage the actuating member and lock the latter against rotation during the'unwinding'of the spring, said ring having a recess 10 releasethe actuating member and permit the pawl to swing into engagement with the ratchet (luring the winding of the spring.

T. In a dynamo-electric firing apparatus, a spring for rotating the armature of the apparatus, a ratchet connected with the spring, a drum to rotate the ratchet, a'pawl to engage the ratchet, a pawl actuting mem ber, means to present the operation of the latter during the winding and unwinding of the swing, an abutment on the barrel, and a spring mounted inthe path of the abutment to engage the latter and thereby limit the rotation of the barrel.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

Koran) SCHAFFLER. REKTF, erossn 

